Microsoft has pushed out a new update to the Surface Pro 4. It's a minor update that includes improvements related to the device's Realtek audio driver. The software giant says the update will result in better Cortana performance and system stability in general. Here is what the official change-log for the update says: "Realtek Semiconductor Corp. driver for Realtek High Definition Audio (SST) - v 126.96.36.19995 - Improves system stability and Cortana performance." This is the first Surface Pro 4 update that Microsoft has pushed out in last four months.